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Table 2: 
Ordering clinicians by specialty
CT Angiography (%)Contrast-Enhanced MR Imaging, Brain (%)Contrast-Enhanced MR Imaging, IAC (%)Total (%)
Otolaryngology0 (0%)35 (12%)158 (59%)193 (24%)
Neurology23 (10%)41 (13%)31 (12%)95 (12%)
Internal medicine/primary care specialties13 (6%)137 (45%)68 (26%)218 (27%)
Emergency department191 (84%)63 (21%)3 (1%)257 (32%)
Neurosurgery1 (0.4%)8 (3%)3 (1%)12 (2%)
Othera0 (0%)20 (7%)3 (1%)23 (3%)
  • Note:—IAC indicates internal auditory canal.
  • ↵a Each ordering 3 or fewer studies: Cardiology, Cardiothoracic Surgery, Endocrinology, General Surgery, Hematology/Oncology, Obstetrics and Gynecology, Ophthalmology, Pediatrics, Physical Medicine and Rehabilitation, Pulmonology, Rheumatology, Radiation Oncology, and Urology.